Fixing my subwoofer

I have'nt used my sub for a few weeks and now when i try to use it the power comes on but no sound comes out. ive checked to see if the cable connection was good and nothing changed. i also took it apart to take a look inside to check if anything might have been fried i didnt notice anything, but i also dont know anything about subwoofers so i hope u can help me out here.

I have the same problem since i moved. And my reciever (RX-v750) wont even show it on the face or work in test mode. I hope someone know how to fix this. Yamaha has yet to respond to my emails.I have the same problem since i moved. And my reciever (RX-v750) wont even show it on the face or work in test mode. I hope someone know how to fix this. Yamaha has yet to respond to my emails.

Anonymous

Ditto, i've got all 5 speakers without the Subwoofer. The subwoofer hasn't worked from day one, but I delayed replacing the unit for too long and don't have the warranty, I looked at all soldered connections and none of them have come un-soldered and all connectors are properly connected, can't think of anything but broken component that would cause it from here, nor can I think of a quick fix

Just buy a new one, and it didnt cost me a premium plan to find out. I thought you guys were here to help and not take someones money and then say theres nothing you can do. I am movin on boys. It doesnt take an expert to figure this one out. I just thought you guys would have maybe a better idea. Buh bye.

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Check your wires from the amp to the sub and if possible change them. If that makes no difference the powered sub or the amp have a intermittent problem, but I think it is more than likely the sub, there are probably bad solder connections that need fixing and maybe a good time to consider a repairman to take a closer look.

Although most of my background is in car audio & acoustics, I did have a thought or two about some tests you can do.

DO THIS AT YOUR OWN RISK OF ELECTROCUTION - Have you tried checking the speaker terminals with a voltmeter while the unit is plugged in? I,ve seen solid state amps (both car & home amps do this) kind of lock up and send constant line voltage to the sub. In some cases the sub snaps instantly, high power subs may not. I've used power from a 110v wall outlet to show off some high SPL systems I've built (very painful 60hz earthquakes). So be careful at the sub terminal it may have some voltage at it.-(If it does you probably know the rest of my answer.)- If so the sub will most likely be wasted and fused voice coils are also common when this happens.
If everything checks out okay there (make sure to check if the subs resistance is at spec while you're there) use the voltmeter and start poking around the audio side of things both on the powered sub and RCA's. You may even find a easy problem on RCA cables. Also can/did you plug the RCA's into a known source, to check their output. Most home audio is 1.5v max but some can go as high as 8v max or so. Also don't be afraid to check the simplest of items like source buttons, specifically the tape monitor buttons. My equipment has these such tape functions with little or no indication as to weather or not they are active, and not being plugged into anything you get no sound. I hope I gave some idea's you may not have tried, your fellow Audiophile-
-Dynami

Try hooking up a different signal input to your powered sub, another
stereo or even a dvd players audio output to the sub will work for a
test. Just make sure the subs gain is down before starting. If it
still not producing sound, the subwoofers amplifier is bad. I hope this
helps.

A few more questions-
Does the sub hum without anything plugged into it except for power? If it makes a real loud hum almost a squeal then I think the rca cable between the receiver and the sub is dead shorted and needs to be replaced. If it's more of a low level hum, then it's a ground hum caused by many things, ie........the receiver and the sub being on different power circuits in the house.......sometimes diconnecting the cable tv feed as it enters the room while the sub is connected and humming to see if it stops........the easy fix sometimes is using a 3 to 2 prong ac adapter but lifting the ground on such a powerful amp could be a fire hazard.

I believe you should take time and check your connection.
please use the right cable for your sub. you need the right cable
to boost the sub. Check radio shark or Sam Ask for better sub cable.The better one don't come with your system.

Well there are only a few reasons i can think of that just might be the reason behind said buzzing.

1. It may be connected to another power source ( amplified or powered supply ) or incorrectly connected. It may also be too close to said power supply.Try letting the dog (sub) out on his leash a little Drag out the manual that came with the sub, and check the correct procedure for your type of setup. **People do read manuals still don't they ?**

2.The only other problem i have heard of is port noise in low registers.
Keep the the port area clean, as it may suck up dirt, or even worse,
small children!

3. However, if you're considering placing this subwoofer in a cabinet, I'd
recommend allowing ample breathing room for the heat sink. This can also be done by drilling smaller holes in the cabinet ( 8-12 mm holes - with the owners permission of course) but please do remember to keep the port area clean.

4. The product ie: Velodyne DPS-12 Subwoofer, came with a bad power supply, presuming it is new, check your warranty.
(not very likely - see also scenarios 1, 2 or 3.)

I could either be the sub or the main unit. The main unit actually sends a signal to the sub to turn it on so if that circuit is bad in the main unit the sub is never going to come on. I've also seen bad cables (You'd be amazed at how stubborn people can be when din connectors don't cooperate).